
Having scrolled through the past three pages has been interesting to read too.
Personally I wouldn't include Either Trypticon in the top 5. Granted I have Generations Tryp and his "ship" and base modes are impressive in scale and detail. However, the reason I never really like him ever since G1 (Only buying the Generations toy on impulse in a sale) is because of the third mode. If Trypticon had a robot mode, I probably would have really taken to him. But as he is essentially Mecha-Godzilla with a T-Cog, I always felt he was lacking as a Transformer.
I also have TR Fort Max. I left him in Bot Mode for quite a while until I got around to applying his stickers. Then I tried his altmodes. Now due to space, my plan was to store all the City Bots in City Mode and that is still the case. Fort Max "Laying down" mode is awful. It brought to mind Optimal Optimus.. and the reasons I don't like that toy also.
As an aside, although I don't know if they count as "giant" but from my own experience, I would give honourable mentions to these two:

